import bytestream.J_Echo;
import java.io.FileInputStream;

public class J_SetIn
{
    public static void main(String args[ ])
    {
        try
        {
            System.setIn(new FileInputStream("test.txt"));
            J_Echo.mb_echo(System.in);
        }
        catch (Exception e)
        {
            System.err.println("发生异常:" + e);
            e.printStackTrace( );
        } // try-catch结构结束
    } // 方法main结束
} // 类J_SetIn结束
